Visit the Royal Observatory Greenwich—the historic home of Greenwich Mean Time (GMT) and the Prime Meridian. Stand on the world-famous Meridian Line, placing one foot in each hemisphere, and explore the observatory’s rich history, originally built for the Astronomers Royal in 1675. Discover the stories of space, time, and navigation through engaging exhibits. Enjoy breathtaking views of London from Greenwich Royal Park. As Britain’s oldest purpose-built scientific institution, the Royal Observatory remains a leading center for astronomy, combining history, science, and discovery in an unforgettable experience.